@InProceedings{P07-1040,
  author = 	"Rosti, Antti-Veikko
		and Matsoukas, Spyros
		and Schwartz, Richard",
  title = 	"Improved Word-Level System Combination for Machine Translation",
  booktitle = 	"Proceedings of ACL",
  year = 	"2007"
}
@InProceedings{D08-1011,
  author = 	"He, Xiaodong
		and Yang, Mei
		and Gao, Jianfeng
		and Nguyen, Patrick
		and Moore, Robert",
  title = 	"Indirect-HMM-based Hypothesis Alignment for Combining Outputs from Machine Translation Systems",
  booktitle = 	"Proceedings of EMNLP",
  year = 	"2008"
}